vlib/v/checker/tests/unimplemented_interface_a.vv:7:8: notice: unused parameter: `a`
    5 | struct Cat {}
    6 | 
    7 | fn foo(a Animal) {}
      |        ^
    8 | 
    9 | fn main() {
vlib/v/checker/tests/unimplemented_interface_a.vv:10:6: error: `Cat` doesn't implement method `name` of interface `Animal`
    8 | 
    9 | fn main() {
   10 |     foo(Cat{})
      |         ~~~~~
   11 | }